May I suggest using jruby
Your rule above would translate to:
require 'openhab'
rule "Bathroom night lights ON/OFF" do
changed Bathroom_Presence_Switch, to: ON
run { Bathroom_FloorLight_switch.on for: 2.minutes }
end
Note you’d need to configure the jruby automation addon to install the openhab helper library, as per the installation steps: Installation | OpenHAB JRuby Script Library